GSF600 (JS1A) '00-'04 MK2 HAGON REAR SHOCK. ADJUSTABLE DAMPING AND SPRING PRELOAD, THE DAMPING ADJUSTMENT IS THROUGH A BYPASS CONTROL THAT MAINTAINS REBOUND AND COMPRESSION DAMPING BALANCE. TOOLS AND INSTRUCTIONS FOR ADJUSTING THE DAMPING AND SPRING ARE PROVIDED. TWO YEAR GUARANTEE. FULLY RE-BUILDABLE